Materials for converter furnaces
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The materials used for the change furnaces in the transformation section vary from one design firm to another. Generally, there are three possibilities: 1. Cr-Mo steel; 2. Cr-Mo steel combined with stainless steel; 3. Cr-Mo steel clad with stainless steel. Why is stainless steel needed? Is it to prevent corrosion by high-temperature hydrogen sulfide, or for some other reason? The requirements vary depending on each process package. Could anyone with expertise provide the data related to these process packages so that we can determine what material should be used? A screenshot would be sufficient
1. High temperatures need to be taken into account; in such cases, chromium-molybdenum steel will be used. 2. When hydrogen corrosion is a concern, chromium-molybdenum steel or stainless steel is used for cladding or overlaying. 3. In the case of sulfur corrosion, stainless steel is used
What are the current specifications for converter furnaces?
The material selection for converter furnaces, in theory, should be determined based on specific operating conditions such as the composition and concentration of the media, temperature, pressure, etc. Potential failure modes must also be taken into account, and the choice should be made by drawing on practical experience from similar applications.
In addition to complying with the ASME Code Section II, Part A – 2001 Edition, \"Technical Specification for Chromium-Molybdenum Alloy Steels for Pressure Vessels SA387\", SA387Gr11Cl2 steel plates must also ensure a δs value at the design temperature； The steel plant is required to conduct ultrasonic testing on each sheet in accordance with the requirements of ASME Code, Section II, Part A–2001 Edition, SA-435, and to provide information on the condition of the material after processing (normalizing + tempering), as well as data on specimens subjected to simulated post-weld heat treatment and the relevant heat treatment specifications. 15CrMo forgings must meet the requirements of grades II and III specified in JB4726－94 \"Forgings of carbon steel and low-alloy steel for pressure vessels\". In addition, it is necessary to ensure that the δs value is within the specified range. When rechecking the chemical composition of SA387Gr11Cl2 steel plates, trace elements that can cause temper embrittlement such as Sb, Sn, and As must be analyzed, but they are not used as evaluation criteria. If it exceeds the specified value by too much, it is necessary to consider conducting a step cooling embrittlement test. 3.2.4 The cumulative effects of coil heating, intermediate heat treatment, and final heat treatment during the manufacturing process of SA387Gr11Cl2 steel plates shall not reduce the mechanical properties of the material below the values specified in the standards. This requirement applies both to the steel plate itself and to the weld metal.